1.1  Introduction Civil work is a very essentialmovement for the growth. The present civil work for create any road and railnetwork work is the cement reinforcement concrete .

This cement reinforcementconcrete contains cement, fine and coarse  aggregates and steel . The manufacture ofthese material shall produce the significant quantity of dangerous waste. Thereforefor sustainable development moreover the manufacturing of the constructionalmaterials need toward to be reduced or usage of  local throw away material  has been used . Concreteis a combination of cement, fine aggregate (sand), coarse aggregates (gravel orcrushed stone), and water. Concrete is the most generally used constructionmaterial in the whole  world.

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Concreteare like in composition to mortars which are used to link unit masonry.Mortars, however, are usually made with the  sand as the soil aggregate, whereas  the concrete contains both the fine aggregatesand much larger size aggregates and hence usually have superior in  strength. Concrete consequently has  much wider range of structural applications, pluspavements, footings, pipes, unit masonary , floor slab , beams, column, wall,dam, and tank. There are so many unusual type of concrete used in the civilwork according to their uses.Importantproperties of concrete, governing design of a concrete mix, are strength,durability, workability, economy.

Toughness of concrete means potential ofconcrete to resists its breakdown and decay. Workability is a calculate of the relievethrough which a fresh mix of the concrete or mortar can be mix, thus handled,transported, placed and finished among a smallest amount loss of homogeneityand with no bleeding or segregation in the completed product. It depend onthe  water in the mix  ratio of coarse agg. and fine aggregate,particle obstruction and interlocking etc.

Mixing of concrete shall be done withhand mixing or machine mixing. Concrete should be systematically compacted throughthe operation of placing and shall be suitably placed roughly reinforcement.Concrete may be compacted manually by rodding, tamping, and sometime inner orimmersion vibrator, outer or form vibrator, surface vibrator shall be used forthe compaction purposes.

Concrete should be properly cured for ahead itsstrength and hardness.Inthe good concrete the ingredients  shouldbe of right proportioned, solid enough to be transport or placed in such a waythat the ingredient must not be segregated from each other. Moreover the goodconcrete shall be workable and can be compacted. In the mixing of cleanconcrete and in curing of hardened concrete water is required.

Potable water,which is fit for human drinking, is generally considered as be suitable forconcreting. Concrete shall be workable in clean state, and must have impermeableand durable in toughened state.Gradesof concrete is represent in the conditions of a number preceded by the letter’M’. M refers to the “mix” viz.

aggregate, sand, cement. And the number denotescharacteristic compressive strength of 150 mm cubes at 28 days in MPa (N per mm^2).The”mix” for a specific grade involves the economical selection of relative percentageof cement, fine aggregate, coarse aggregate and water(admixture, if any).Tomodify the  property of concrete somechemical & mineral admixture has been  used. Chemical admixture is – retarders (suchas sugar &  the other chemicals is usedin hot weather concreting and in ready-mixed concreting), accelerator (such ascalcium chloride is used in cold weather ) water-reducer,superplasticizer,air-entraining agent (such as animal/vegetable fats and oils),bondsadmixture . Mineral admixture i.e. very fine-grained inorganic material havingpozzolanic or latent hydraulic property is added to the concrete mix to getbetter the properties of concrete.

Some mineral admixture are Fly ash, Silicafume, Ground granulated blast furnace slag (GGBFS or GGBS), High reactivityMetakaolin (HRM) etc. 1.2 Methodsof improving strength to structure are :-1.2.1   Ricehusk ash (RHA) :- Rice husk ash  is an experimented for the replacement ofcement.

It is reported in that locally available rice husk ash could be used aspartial replacement for ordinary Portland cement. Rice husk mostly are thecoatings of seeds or grains of rice. Rice husk protects the seeds during thegrowing season , since it ha been formed from hard materials ,including silicaand lignin.

The husk is generally indigestible to humans as well as for  the environment. When the rice is ready , thenby the  mechanical methods or by the  man power  rice can be separate from  rice hulls or husks . The Combustion of ricehulls results  rice husk ash. This ash isthe prospective supply of amorphous reactive silica, which have a varieties ofapplications in material science. Most of the ashes are used in the making ofportland cement.  The ash also is thevery good thermal insulation material. This fineness of the ash has also makeits a very good applicant for the sealing of fine cracks in civil structures,where it could be break in deeper then the conventional cement sand mixture.

The number of possible uses for rice husk ash(RHA) included absorbents for oilsand chemicals, a source of silicon, insulation powder in steel mills, asrepellents in the form of ‘vinegar-tar’ release agent in the ceramics modern asthe insulation material. Rice husk could also be burnt into the ash thatfulfill the physical characterstics and chemical composition of mineraladmixture. Pozzolanic activity of rice husk ash depends on (1) is silicacontent (2) is silica crystallization phase and  (3) is size and surface area of ash particle.In adding up, ash  mustly contain only littleamount of carbon.

The optimized rice husk ash prohibited by burn or  by grinding, have been used as the pozzolanicmaterial in cement and concrete. Using it provides the several advantages suchas improved strength and durability properties and environmental profits linkedto the disposal of waste materials and to decrease carbon dioxide emissions.Rice husk ash has been used in the concreteconstruction as an another of cement. The rice milling industry gaves the bi-product rice husk. Due to the growing rateof ecological pollution and the thoughtfulness of sustainability factor hasmade the idea of utilize rice husk.

The reason behind the practice of rice husk asan another for cement in concrete manufacturing are explained in the additionalstudy. The rice husk itself has a very rough surface which is rude in nature.